When Steve Lopez saw Nathaniel Ayers playing his heart out on a two-string violin on Los Angeles' skid row, he found it impossible to walk away.More than thirty years earlier, Ayers had been a promising classical bass student at Juilliard—ambitious, charming, and also one of the few African-Americans—until he gradually lost his ability to function, overcome by schizophrenia. When Lopez finds him, Ayers is homeless, paranoid, and deeply troubled, but glimmers of that brilliance are still there.Over time, Steve Lopez and Nathaniel Ayers form a bond, and Lopez imagines that he might be able to change Ayers's life.Lopez collects donated violins, a cello, even a stand-up bass and a piano; he takes Ayers to Walt Disney Concert Hall and helps him move indoors. For each triumph, there is a crashing disappointment, yet neither man gives up. In the process of trying to save Ayers, Lopez finds that his own life is changing, and his sense of what one man...